---------- Forwarded message ---------- Date: Fri, 20 Apr 2001 11:27:02 -0400 (EDT) From: AIP listserver <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Subject: physnews PHYSICS NEWS UPDATE The American Institute of Physics Bulletin of Physics News Number 535 April 20, 2001 by Phillip F. Schewe, Ben Stein, and James Riordon SPINTRONIC PROBE MICROSCOPES. Spin-polarized electronics, or spintronics, exploits the fact that an electron is not just electrical but also magnetic. Now this applies to scanning tunneling microscopy (STM) as well. A Hamburg-Julich collaboration has coated an STM tip with magnetic material which provides a tunneling current of spin-polarized (SP) electrons flowing between probe and sample (Heinze et al., Science, 9 June 2000). The SP-STM method is used not so much to image atoms in a sample as to map their magnetism. Previous to this one could map magnetism in a bulk material by scattering neutrons from the atoms, or the magnetic properties of surface atoms, in films or in nanoscale magnets, say, but only at the scale of 10 nm or more. With the spintronic STM one can now map surface magnetism at the atomic scale. A still newer study, by the same group, broadens the use of spintronic STM to more complex types of magnetic behavior, such as antiferromagnetism, helical magnetism, and spin-density waves. (Wortmann et al., Physical Review Letters, 30 April 2001; contact Stefan Bluegel, 49-2641-614249, [EMAIL PROTECTED]; http://www.flapw.de/art.html) HELIUM-9 GROUND STATE OBSERVED. Making superheavy [SSZ: text deleted] A BRIGHT IDEA FOR CARBON NANOTUBES. Tiny columns [SSZ: text deleted] EKPYROSIS: A NEW THEORY OF THE BIG BANG. Most [SSZ: text deleted] ____________________________________________________________________ The ultimate authority...resides in the people alone. James Madison The Armadillo Group ,::////;::-. James Choate Austin, Tx /:'///// ``::>/|/ [EMAIL PROTECTED] www.ssz.com .', |||| `/( e\ 512-451-7087 -====~~mm-'`-```-mm --'- --------------------------------------------------------------------
